Problem 1: Tracing Understanding

Which of the below blocks of code will create the image to the right? The window measures 500 x 200 pixels and the value of d is 150.

x, y = 250 - d / 2, 100 - d / 2
a1 = GArc(x, y, d, d, 90, -180)
gw.add(a1)

x, y = 250 - d, 100 - d
a1 = GArc(x, y, d, d, -180, 90)
gw.add(a1)

x, y = 250 - d / 2, 100 - d / 2
a1 = GArc(x, y, d, d, 90, 180)
gw.add(a1)

x, y = 250 - d / 2, 100 - d / 2
a1 = GArc(x, y, d, 180, -90)
gw.add(a1)

Problem 2: An Arrowhead

• This is a coding problem, work in pairs or trios on a single computer
• In arrow.py, I’ve drawn the initial shaft of an arrow for you (you are welcome)
• Your task is to add an arrow head to the right end of the arrow, which should look as shown below:

Problem 2b: The Fletchings

• Switch who is typing!
• No arrow will fly straight without its fletchings. Now add two parallelograms on the left end of the arrow.

• Mimic the dimensions and angles as closely as possible!

Problem 2c: The Flight

• Switch who is typing!
• Up until this point, everything has just been added to the GWindow
• Change that, creating a GCompound and add everything to that instead
• Add the GCompound to the left edge of the window, and animate it flying to the right
• BONUS: stop the animation when the tip of the arrow hits the right side of the screen

Time It!